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Ln<sub>0.7</sub>Ca<sub>0.3</sub>MnO<sub>3</sub>(Ln = Nd, Sm, La)의 자기적 전기적 특성
전검배,임흥수,이찬규,구본흔,이상민,정명화,조영훈,Chon, Gom-Bai,Im, Hung-Su,Lee, Chan-Gyu,Koo, Bon-Heun,Lee, Sang-Min,Jung, Myung-Hwa,Jo, Young-Hun 한국재료학회 2007 한국재료학회지 Vol.17 No.4
Effects of doping rare earth elements on Ln site of $Ln_{0.7}Ca_{0.3}MnO_3$ (Ln = N d, Sm and La) were examined from structure, magnetic and electrical properties. Size of a-axis increased as following order of La < Nd < Sm, whereas c-axis was not much changed. Curie temperatures of 170 K for $Nd_{0.7}Ca_{0.3}MnO_3$, 110 K for $Sm_{0.7}Ca_{0.3}MnO_3$ and 250 K for $La_{0.7}Ca_{0.3}MnO_3$ were obtained. This result coincides with change of Mn-O bond length causing by a-axis lattice constant. The highest magnetroresistance ratios were 22% at 77 K for $Sm_{0.7}Ca_{0.3}MnO_3$, 32% at 110 K for $Nd_{0.7}Ca_{0.3}MnO_3$, and 33% at 180 K for $La_{0.7}Ca_{0.3}MnO_3$.
Ln<sub>0.7</sub>Ca<sub>0.3</sub>MnO<sub>3</sub> (Ln=Nd, Sm, La)의 소결 거동 및 특성
전검배,구본흔,이찬규,Chon, Gom-Bai,Koo, Bon-Heun,Lee, Chan-Gyu 한국재료학회 2006 한국재료학회지 Vol.16 No.1
Effects of doping rare earth element on Ln site of $Ln_{0.7}Ca_{0.3}MnO_3$ (Ln=Nd, Sm and La) were examined from sintering behavior, structure and magnetic properties. Sintering reactions proceeded rapidly in order of $La_{0.7}Ca_{0.3}MnO_3>Nd_{0.7}Ca_{0.3}MnO_3>Sm_{0.7}Ca_{0.3}MnO_3$. This result can be explained by diffusivity of metal cation. Size of a-axis increased as following order of La<Nd<Sm, whereas c-axis was not much changed. Curie temperatures of 123K for $Nd_{0.7}Ca_{0.3}MnO_3$, 93K for $Sm_{0.7}Ca_{0.3}MnO_3$ and 225K for $La_{0.7}Ca_{0.3}MnO_3$ were obtained. This result coincides with change of Mn-O bond length causing by a-axis lattice constant.